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diff --git a/cmd/pr-analyzer/types.go b/cmd/pr-analyzer/types.go
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+++ b/cmd/pr-analyzer/types.go
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+package main
+
+import (
+	"time"
+)
+
+// PRData represents a pull request with its reviews and comments.
+type PRData struct {
+	// Number is the pull request number
+	Number int
+	// CreatedAt is the timestamp when the PR was created
+	CreatedAt time.Time
+	// Reviews contains all reviews submitted for this PR
+	Reviews []ReviewData
+}
+
+// ReviewData represents a review submitted on a pull request.
+type ReviewData struct {
+	// Reviewer is the GitHub username of the person who submitted the review
+	Reviewer string
+	// State represents the review state: APPROVED, CHANGES_REQUESTED, or COMMENTED
+	State string
+	// SubmittedAt is the timestamp when the review was submitted
+	SubmittedAt time.Time
+	// Comments contains all inline comments made during the review
+	Comments []CommentData
+}
+
+// CommentData represents an inline comment made during a review.
+type CommentData struct {
+	// Reviewer is the GitHub username of the person who made the comment
+	Reviewer string
+	// CreatedAt is the timestamp when the comment was created
+	CreatedAt time.Time
+	// Path is the file path where the comment was made
+	Path string
+	// Line is the line number where the comment was made
+	Line int
+}
+
+// ReviewerMetrics holds the analysis results for a single reviewer.
+type ReviewerMetrics struct {
+	// Username is the GitHub username of the reviewer
+	Username string
+	// PRsReviewed is the total number of PRs reviewed by this person
+	PRsReviewed int
+	// AverageReviewSpeed is the average time (in hours) from PR creation
+	// to the reviewer's first comment
+	AverageReviewSpeed float64 // in hours
+	// AverageComments is the average number of inline comments made
+	// per PR when the reviewer comments
+	AverageComments float64
+	// ImmediateApprovals is the percentage of PRs that were approved
+	// without requesting changes first
+	ImmediateApprovals float64 // percentage
+}
+
+// ReviewPattern represents the approval pattern for a PR.
+type ReviewPattern struct {
+	// IsImmediateApproval indicates if the PR was approved without
+	// requesting changes first
+	IsImmediateApproval bool
+	// FirstReviewState is the state of the first review submitted
+	FirstReviewState string
+	// FinalReviewState is the state of the last review submitted
+	FinalReviewState string
+	// TimeToFirstReview is the duration from PR creation to first review
+	TimeToFirstReview time.Duration
+	// TimeToFinalReview is the duration from PR creation to final review
+	TimeToFinalReview time.Duration
+}
+
+// PRMetrics holds all metrics for a single PR.
+type PRMetrics struct {
+	// Number is the pull request number
+	Number int
+	// CreatedAt is the timestamp when the PR was created
+	CreatedAt time.Time
+	// ReviewPatterns contains the review patterns for each reviewer
+	ReviewPatterns []ReviewPattern
+	// CommentsPerFile maps file paths to the number of comments made
+	// on that file
+	CommentsPerFile map[string]int
+	// Reviewers is the list of GitHub usernames who reviewed this PR
+	Reviewers []string
+	// TimeToFirstReview is the duration from PR creation to the first
+	// review being submitted
+	TimeToFirstReview time.Duration
+}
+
+// Analyzer processes PR data and generates metrics.
+type Analyzer struct {
+	// startDate is the beginning of the analysis period
+	startDate time.Time
+	// endDate is the end of the analysis period
+	endDate time.Time
+}
+
+// NewAnalyzer creates a new PR analyzer with the specified date range.
+func NewAnalyzer(startDate, endDate time.Time) *Analyzer {
+	return &Analyzer{
+		startDate: startDate,
+		endDate:   endDate,
+	}
+}